This one only makes sense in the context of the qemu-io tool, so move it
to qemu-io.c. Adapt coding style and register it like other commands.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>